<nav class="navbar fixed-top navbar-dark ad-nav-bar navbar-expand-lg bg-default">
    <div class="container">
        <a class="navbar-brand" href="">
            <img src="upload/images/logo.png" height="30" alt="">
        </a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav"
                aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse" id="navbarNav">
            <ul id="menu" class="navbar-nav">
                <li data-menuanchor="page1" class="nav-item active">
                    <a class="nav-link" href="#page1">首页 <span class="sr-only">(current)</span></a>
                </li>
                <li data-menuanchor="page2" class="nav-item">
                    <a class="nav-link" href="#page2">简介</a>
                </li>
                <li data-menuanchor="page3" class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="#page3"
                       id="navbarDropdownMenuLink" data-toggle="dropdown"
                       aria-haspopup="true" aria-expanded="false">
                        产品
                    </a>
                    <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                        <li><a class="dropdown-item" href="#">菜单1</a></li>
                        <li><a class="dropdown-item" href="#">菜单2</a></li>
                        <li><a class="dropdown-item" href="#">菜单3</a></li>
                    </ul>
                </li>
                <li data-menuanchor="page4" class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="#page4"
                       id="navbarDropdownMenuLink2" data-toggle="dropdown"
                       aria-haspopup="true" aria-expanded="false">
                        下载
                    </a>
                    <ul class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink2">
                        <li><a class="dropdown-item" href="#">菜单1</a></li>
                        <li><a class="dropdown-item" href="#">菜单2</a></li>
                        <li><a class="dropdown-item" href="#">菜单3</a></li>
                        <li><a class="dropdown-item" href="#">菜单4</a></li>
                    </ul>
                </li>
                <li data-menuanchor="page5" class="nav-item">
                    <a class="nav-link" href="#page5">活动</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" target="blank" href="info/list">资讯</a>
                </li>
                <li data-menuanchor="page7" class="nav-item">
                    <a class="nav-link" href="#page7">我们</a>
                </li>

            </ul>
        </div>
    </div>
</nav>